Buidkite pipeline

[leo-ri]

What does this PR do?

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Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.md or CHANGELOG-developer.md.

Author's Checklist

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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @leo-ri? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

💚 Build Succeeded

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• Start Time: 2023-08-09T16:08:30.842+0000

• Duration: 21 min 36 sec

❕ Flaky test report

No test was executed to be analysed.

🤖 GitHub comments

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

[cmacknz]

We are planning to archive this repository: #306

The shipper has already been removed from the unified release process.

It likely makes sense to stop working on the conversion to buildkite here, we can just decommission the Jenkins repositories. CC @alexsapran @roaksoax